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Civ2civ3 is a ruleset shipped with Freeciv 2.5 and later, designed to be the new default ruleset later. The ruleset is based on earlier modpacks for 2.4 (civ2civ3) and 2.3 (civ2-3). The former default ruleset was renamed to classic.

Users (with admin rights for a Windows installation) can edit …/data/default.serv to get their favourite ruleset as default. Changing the ruleset in an already running client will reset all saved options to server defaults and then apply the ruleset settings, i.e., all saved settings are lost. Or in other words, any saved settings only affect the initially loaded ruleset.

The ruleset supports three additional governments tribal, fundamentalism, and federation. It uses the same values for [effect_empire_size_base_…] and [effect_empire_size_step_…], i.e., the first citizen unhappy about an empire with many cities appears at the same rate as the next citizen unhappy about this issue.

Snapshot of …/data/civ2civ3/README.civ2civ3 (incl. date, please refresh if outdated):

=======================================================
Civ2Civ3 Ruleset for Freeciv v2.6 (Updated 16-Mar-2015)
=======================================================


OBJECTIVES:
-----------

- The main purpose is to get a gameplay more similar to civ3, keeping
  the combat system from civ2.

- Reduced micromanagement as much as possible. Don't be afraid by the
  amount of changes, I think this ruleset is easier to learn than
  classic rules, and it is designed so there is not a big disadvantage
  when you do not play optimally. I hope both rookies and experienced
  players can enjoy it.

- Removed the rules that allowed a sudden boost: mainly rapture growth,
  national trade routes, and the big bonuses from some governments.

  The result should be a simpler and more linear development of your
  cities, and a slower paced gameplay. With governments that keep a
  similar balance along the different ages, and smoother effects of
  terrains, units, buildings and wonders.

- All the new rules have been adapted so AI can play with them, and to
  avoid possible exploits by human players.

I wish to keep it updated and to improve it with the comments from the
players.


INFO:
-----

- Help texts have been updated (mainly Buildings and Wonders), so the
  info showed ingame already takes into account the changed rules. Note
  that some graphical tables from the Manual will not match (mainly
  Terrains and Governments), so better use the tables in this ReadMe as
  reference.

- I suggest new players to start a game with 6 players or so, AI skill
  level Normal, and default ruleset options (Small continental map with
  100 land tiles per player). This way AI will progress at similar pace
  than real history.

- Cheating AI level was adjusted for these rules, I suggest experienced
  players to use it.
  CHEATING AI: +40% Science, Luxury, Gold and Shield production,
  +50% unit Defense in land (outside cities), -20% Pollution,
  +20 AI love, +20% Veteran chance, +20% Incite and Bribe costs,
  +1 Content per city.

The following is a full list of changes compared to classic ruleset...


CORE CHANGES:
-------------

- No Rapture Growth (Celebration only causes additional Trade per tile,
  same as civ3). Foodbox readjusted to keep a constant city growth.

- Settlers cost 2 population (as in civ3). This way, the number of tiles
  worked in the original city are reduced by 2, equal to the number of
  tiles worked in the newly created city.

- Disabled national Trade Routes: it is still possible to create Trade
  Routes, but only to foreign cities that you are not at war with.
  Each city can support a maximum of 2 trade routes. Removed the one
  time revenues.

- Every unit pays some kind of Upkeep cost. Under some governments, this
  upkeep is changed from Shields to Gold (similar to civ3).

- A city can support as many Military units as its population size
  (min 4, max 20). Additional units cause waste of Food. If the city
  shrinks due to starvation, one of those extra units will be disbanded.

- Units lose one Veteran level when upgraded.

- Enabled tired attack: units that attack with less than a single move
  point will have their attack power reduced accordingly.
  If they have 2/3 movement points, they will attack with 2/3 strength.
  If they have 1/3 movement points, they will attack with 1/3 strength.

- Unlimited movement on rails delayed to maglev (available with
  Superconductors). Movement bonus on Railroads x6, on Roads x3, on
  Rivers x3 (non diagonal).

- The 'restrictinfra' server setting applies to rivers as well as to
  roads/railroads.

- Added Fort and Airstrip bases, required before you can build Fortress
  or Airbase, respectively. It prevents the construction of full bases
  in one single turn. The bases no longer protect full stacks from being
  killed when one unit is defeated.

- Specialists output reduced to 2 (same as civ2). There are wonders that
  increase it to 3 for all players.

- Enabled Tech Leakage: technologies are cheaper if already discovered
  by other nations you have Embassy with.

- The cost of each Tech is equal to the number of steps needed to get
  the tech (Tech Cost = Base Cost * Number of Parents). It is a linear
  formula more similar to civ2, and it fits better the new reduced
  bonuses from Trade and Science.

- Tech Upkeep assigned to Cities: some science is required from each
  city to maintain a given technological level. The upkeep grows from 0
  during the middle ages, up to 10 Bulbs per city when the whole tech
  tree was researched. If the global balance of Bulbs ends negative, one
  technology is lost, and half of its value is restored to the count of
  Bulbs.

- No holes allowed in tech tree. To acquire a tech you must know its
  prerequisites, and you cannot lose a tech that another depends on.

- Enabled risk of Plague at cities with pop greater than 4. Chances
  reduced by the buildings Aqueduct and Sewer System, the tech Medicine,
  and the wonder Cure for Cancer.

- Added other random disasters: Earthquake, Fire, Flood, Industrial
  Accident, and Nuclear Accident.

- Increased AI_love for AI players, in order to reduce the amount of
  wars between them.

OPTIONAL RULES:

- Every player starts with 1 free Tech, 1 Settler, 1 Worker and
  1 Explorer.

- Minimum Distance between cities set to 3.

- Initial National Border equal to city radius (2 tiles).

- Restricted the use of infrastructure (roads, railroads, and rivers)
  for enemy units.

- Unreachable units do not protect reachable ones.

- Set Occupy Chance to 100%: Units automatically move to the target tile
  if the attack is successful and ZoC rules allow the movement.

- Disabled Happy Borders: Military Units cause unhappiness if they end
  the turn outside cities or fortresses, no matter if they are inside
  national borders.


FOODBOX:
--------

- City FoodBox Size uniformed to even the population wasted when you
  build Settlers at larger cities (similar to civ3).

- Granary size is fixed to 10 Food for every city size.

- Cities with Pop <= 4 receive this granary effect for free, so they can
  create Settlers at best rate even without Granary. (This free granary
  helps the AI to build Settlers optimally).

CITY   FOODBOX   SETTLER    FOODBOX   SETTLER
SIZE    NEW       NEW        OLD       OLD
1      20        -          20        -
2      20(10)#   -          30(15)    20(5-15)
3      20(10)#   20(20)     40(20)    30(10-20)
4      20(10)#   20(20)     50(25)    40(15-25)
5      20(10)    30(20)     60(30)    50(20-30)
6      30(10)    40(20)     70(35)    60(25-35)
7      30(10)    50(30)     80(40)    70(30-40)
8      40(10)    60(40)     90(45)    80(35-45)
9      40(10)    70(50)     100(50)   90(40-50)
10     40(10)    80(60)     110(55)   100(45-55)
11     40(10)    80(60)     120(60)   110(50-60)
12     40(10)    80(60)     130(65)   120(55-65)
13     40(10)    80(60)     140(70)   130(60-70)
14     40(10)    80(60)     150(75)   140(65-75)
15     ...       ...        ...       ...

# Granary effect for free when city grows to this city level.
FOODBOX = Foodbox size at that city level. (In brackets = Granary size).
SETTLER = Food needed to recover the population if you create a Settler
          at that city size. (In brackets = The same but with Granary).
NEW = This ruleset. OLD = Classic ruleset

TIP: In order to keep max growth, you should build the Granary before
     city grows larger than Pop 4 (same as Aqueduct at Pop 8, and
     Sewer System at Pop 16).
TIP: Optimal production of Settlers occurs at any city with Pop <= 4, or
     cities with Granary and Pop <= 6.


TERRAIN:
--------

- Jungles receive +1 Shield (1/1/0). Swamps can be irrigated for +1 Food
  (to 2/0/0). Tundras can be mined for +1 Shield (instead of irrigated)
  and receive +1 Trade when roaded (up to 1/1/1).

- Deserts with a river receive 1 extra Food from irrigation (to boost
  growth at terrains like Nile flood), unless they have an Oasis.

- Reduced Food bonus by 1 to Swamp/Spice; the original bonus can be
  obtained by irrigating the Swamp.

- Hills receive 1 Shield for free, and +2 from mines, same as civ3,
  (was 0 and +3). Mountains receive +2 Shields from mines too (was +1).

- Mountains give extra vision range. Cities can not be placed over
  Mountains. Land units starting the turn on unroaded Mountains receive a -1
  penalty to movement (this way it is not so good for cavalry to end the
  turn on Mountains).

- The discovery of Refining allows to upgrade the mines placed on
  Deserts and Glaciers to Oil Wells (+2 Shields).

- Lake tiles receive for free +1 Food (2/0/2), while Harbours and
  Offshore Platforms do not affect them. Lakes do not enable wonders
  that needs a coastal city.

- Deep ocean tiles must be mined (resulting in an Oil Well) in order to
  take advantage of the shield bonus from Offshore Platforms.

- Pollution may appear in Ocean tiles, and Transports can clean it
  without the need of Workers/Engineers. Jungles and Forests are not
  affected by Pollution nor by Global Warming.

- Minimum city output = 1/0/0 (was 1/1/0). City central tile now
  produces +1 Shield.
  This way, no matter the tile where you place your city, you never
  waste any resource (for example, with classic rules, a city placed
  over bonused Grassland was wasting the Shield bonus).

TILE      F/P/T  IRRIG(t)   MINE(t)    ROAD   MAX1   MAX2   TRANSFORM
Deep      1/0/2  NO         NO         NO     2/0/2  2/1/2  No
Ocean     1/0/2  NO         NO         NO     2/0/2  2/1/2  Grass(36)
Lake     *2/0/2  NO         NO         NO     2/0/2  2/1/2 *Grass(36)
Swamp     1/0/0 *+1(5)     *NO         +0(4)  2/0/0  3/0/0 *Grass(24)
Glacier   0/0/0  NO         +1(10)     +0(4)  0/1/0  0/3/0 *Lake(24)
Tundra    1/0/0 *NO        *+1(5)     *+1(2)  1/1/1  1/1/1 *Plains(24)
Desert    0/1/0  +1(5)      +1(5)      +1(2)  0/2/1  0/4/1  Plains(24)
Plains    1/1/0  +1(5)      Forest(10) +1(2)  2/1/1  3/1/1 *Lake(36)
Grassland 2/0/0  +1(5)      Forest(15) +1(2)  3/0/1  4/0/1 *Lake(36)
Jungle   *1/1/0 *Swamp(10) *NO         +0(4)  1/1/0  1/1/0 *Forest(24)
Forest    1/2/0  Plain(10) *Grass(15)  +0(4)  1/2/0  1/3/0 *Hills(24)
Hills    *1/1/0  +1(10)    *+2(10)     +0(4)  1/3/0  1/4/0  Plains(24)
Mountains 0/1/0  NO        *+2(10)     +0(6)  0/3/0  0/4/0  Hills(36)

F/P/T = Food/Production/Trade; (t) = turns
MAX1 = irrigated/mined/roaded/harbour; MAX2 = farmland/railroad/oil well.
* = Changes compared to classic ruleset. Most affected are Jungles,
    Swamps and Tundras.

TIP: The optimal tiles to place your initial cities are those with MAX
     output equal or greater than 2/1/1, mainly those with bonus
     resources or rivers. Hills and Plains are always good places for
     cities, as well as Flood Desert (desert with river), or bonused
     Grassland. The best defense comes from cities placed on Hills with
     river.


DEFENSE:
--------

- Halved the terrain defense bonuses, now more similar to civ3 values:

TERRAIN                  NEW      OLD
Forest/Jungle/Swamp      +25%     +50%
Hills                    +50%     +100%
Mountains                +100%    +200%

RIVER                    +25%     +50%

FORTIFIED                +50%     (=)
(only Land and Big Land units can fortify; inside cities, they are
always considered fortified)

VETERAN
Veteran                  +50%     (=)
Hardened                 +75%     (=)
Elite                    +100%    (=)

BASE
Fort     (vs Land/Sea)   +50%
Fortress (vs Land/Sea)   +100%    (=)
Airstrip (vs Air)        +50%
Airbase  (vs Air)        +100%    +0%

- Every City of any size receives an inherent Defend_Bonus = +50%
  against all kinds of land units.

- Every City with Pop>8 receives an additional free Defend_Bonus = +50%
  against both land and sea units.

- Walls effect reduced from 200% to 100%, and cost reduced from 60
  to 30.

- Great Wall gives additional Defend_Bonus = +50% against Land units,
  and prevents population loss in any city when a defending unit loses.

The total city defense is similar to classic ruleset, but here cities
receive some wall bonus for free, and large cities receive an extra
bonus, as in civ3:

CITY             VS LAND  VS SEA   VS AIR   VS MISSILE
Town (Pop<=8)    +50%(+)  +0%(=)   +0%(=)   +0%(=)
City (Pop>8)     +100%(+) +50%(+)  +0%(=)   +0%(=)

Buildings each add:
Walls            +100%    +0%      +0%      +0%
Great Wall(W)    +50%     +0%      +0%      +0%
Coastal Defense  +0%      +100%    +0%      +0%
SAM Battery      +0%      +0%      +100%    +0%
SDI Defense      +0%      +0%      +0%      +100%

Total Defense = (UNIT DEFENSE) * (100+TERRAIN)/100 * (100+RIVER)/100
 * (100+CITY+BASE)/100 * (100+FORTIFIED)/100 * (100+VETERAN)/100
(Same as classic rules).

EXAMPLE: Riflemen fortified in a fortress, on mountains, with a river,
         will get a total defense of 30 against land attacks:

         Riflemen: defense 4
         Fortified (+50%): 4 + 2 = 6
         In Fortress (+100%):      6 + 6 = 12
         On Mountains (+100%):             12 + 12 = 24
         With River (+25%):                          24 + 6 = 30.

EXAMPLE: Riflemen in a size 9 city, with walls, on hills,
         will get a total defense of 27 against land attacks:

         Fortified (+50%): 4 + 2 = 6
         On Hills (+50%):          6 + 3 = 9
         In City with Walls (+200%):       9 + 18 = 27.


GOVERNMENTS:
------------
                  Anarch   Tribal   Despot   Monarc   Fundam   Republ   Democr   Federat  Commun
Tax/Lux/Sci Rate  0        60       60       70       70       80       90       90       80
Output per tile # -1(if>2) -1(if>2) -1(if>2) 0        0        +1Trade  +1Trade  0        0
Celebration Bonus (no -1)  (no -1)  (no -1) (+1Trade) 0       (+1Trade)(+1Trade)(+1Trade) 0

Unit Upkeep       Shield   Shield   Gold     Gold     Gold(x2) Shield   Gold(x2) Gold(x2) Shield
Free Units        2\2      2\2      2\2      3\3      2\2      1\1      1\1      2\2      3\3
Mil Unhappiness   0        0        0        -1       -1       -1       -2       -1       -1
Martial Law       +1       +2       +1       +1       0        0        0        0        +2

Civil war %       99       90       80       70       60       40       30       20       50
Empire Size       0        /14      /10      /12      /20      /16      /32      /24      /28
Special          +NoUpkeep +Veteran +75%Gold +50%Gold +Tithes  +Bribe  +Brib/Sub +Subvert +NoUpkeep
                 -50%Lux  (Land/Mil)(Palace) (Palace) -50%Sci  -Revolt -Rev/Sen  -Senate  (Cost=1)
                 -NoTaxes                             +Fanatic         +Partisan +Luxury  +Partisan

Base Corruption   0%       30%      20%      10%      15%      25%      5%       0%       30%
Corrup by Dist *  1        1        1        1        1        1        1        0        0
Base Waste        30%      0%       10%      20%      15%      5%       25%      30%      0%
Waste by Dist **  1        1        1        1        1        1        1        0        0

* Corruption by Distance is doubled until The Corporation is researched
  by the player (or increased to 1 for Federation).
** Waste by Distance is doubled until Trade is researched by the player.
# This penalty is negated by The Pyramids wonder, or when Railroad is
  researched by the player.
+ Partisans appear in conquered cities (democratic or communist) if
  Guerilla Warfare has been researched by any player.

Added Fundamentalism (available with Theology), Tribal (available at
start) and Federation (available with Economics).

- "Base Corruption/Waste": Modern governments cause less Trade
  Corruption, but more Wasted Production. The total % lost (Waste +
  Corruption) is equal for all governments.

- "Empire Size" (number of cities that start causing extra unhappiness):
  Modern governments have double size limit than his ancient
  counterpart. Empire Base Size is equal to Empire Step Size for every
  government.

- "Unit Upkeep": Tribal, Republic and Communism use the standard unit
  upkeep by Shields, while the other governments use Gold upkeep (x2
  Gold per unit for modern governments).

- "Free Units": Means units free of Gold/Shield upkeep and also free of
  Military Unhappiness. By default 2 free units per city.

- "Mil Unhappiness": Most governments are affected by Military
  Unhappiness due to units out of cities/fortresses (same than Republic
  in classic ruleset).

- "Martial Law": Max 3 units can apply Martial Law (was max 20 for
  Despotism and Anarchy).


- The bonus "+1 Trade" under Republic and Democracy does not affect
  oceanic tiles. This way, oceanic tiles are more even to land tiles
  under any government.

- Republic receives Revolution_When_Unhappy and has unbribable units,
  Federation receives Has_senate and has unincitable cities (Democracy
  receives all them).

- Spies built under Communism or Federation will start at the first
  veteran level. Federation grants +3 Luxury per city.

- Under Communism you do not pay upkeep for buildings that cost 1 Gold.
  Communism cancels the bonus from Mysticism and Theology (to Temples
  and Cathedrals).

- Under Fundamentalism you receive extra Gold from Tithes, but -50% to
  Science.

- The Bonus to production at Palace (under Despotism and Monarchy)
  switched from Shields to Gold.

- Tribal government increases by half the chance of land units getting
  the next veteran level after a battle. They are tribal warriors,
  maintained with Shields instead of Gold.

TIP: There is some hurry to get Monarchy or Republic (or to build
     Pyramids), in order to avoid the initial penalty to output per
     tile. However, the Corruption and Waste are evened for all
     governments, so there are no big differences, and every government
     could be used at any technological age. The choice depends on the
     role of your civilization.


TECHS:
------

- Added new wonders: Mausoleum of Mausolos (available with Ceremonial
  Burial), and Statue of Zeus (available with Polytheism). Oracle of
  Delphi renamed to Temple of Artemis (in order to allow all 7 wonders).

- Moved Great Wall to Construction (was Masonry). Moved King Richard's
  Crusade to Chivalry, so it requires Monarchy and Knights. Women's
  Suffrage moved to Conscription, so it requires Democracy. Switched
  Darwin's Voyage and Eiffel Tower (Darwin was earlier than Eiffel).
  Shakespeare's Theatre available with Sanitation (was Medicine).

- Diplomats available with Alphabet (was Writing), and Migrants with
  Pottery, so every initial tech allows some unit or building.

- Coastal Defense moved to Magnetism*. AI likes defense improvements and
  this change encourages them to develop Frigates/Galleons early in
  game.
  (*) The labels and icons for "Magnetism" and "Navigation" were
  switched, because compass was already used by historical Caravels,
  while sextants were not invented until the age of Galleons/Frigates.

- Construction requires Iron Working instead of Currency. This way,
  Iron Working is a prerequisite to build Frigates and Ironclads.

- Bridge Building merged to old Engineering in the tech tree. Added
  modern "Engineering" in the Industrial Ages that allows Destroyers
  (was Electricity) and Transports (was Industrialization), and it is
  required for Steel (Cruiser), Amphibious Warfare (Ports), and
  Combustion (Submarines).

- Battleship available with Mass Production instead of Automobile.
  Mfg Plant available with Plastics (was Robotics).

- Nuclear Fission requires Refrigeration, in order to delay the Atomic
  age, and to force the AI to research farms. Communism requires
  Theology (Fundamentalism) instead of Philosophy, to encourage AI to
  research all governments.

- Fusion Power allows Engineers to perform terrain transformations, that
  were simplified so there is no need to chain more than one
  transformation in the same terrain.

Special effects:
- Astronomy: Increases units vision when in fortresses.
- Invention: Halves upgrade cost of your units.
- Medicine: Reduces by 30% the chance of illness in your cities.
- Electricity: Allows irrigation without adjacent water, increases city
  vision radius, and the effect of Colosseums.
- Trade: Decreases one-time the waste of Shields caused by distance to
  capital.
- The Corporation: Decreases one-time the corruption of Trade caused by
  distance to capital.

The Techs, Buildings, Wonders and Units are the same as civ2, but some
requirements have been changed to improve a bit the historical accuracy,
to encourage the use of every military unit, and to avoid units or
wonders becoming obsolete too soon. The following is a list of some
inaccuracies from classic tech tree that were addressed in the new tree:
- It was possible to research Pikemen before Phalanxs; Musketeers before
  Pikemen; Ironclads before Frigates; Destroyers before Ironclads;
  Armors before Artillery; Mech Infantry without Barracks III.
- Cathedrals did not require Construction nor Masonry. Ironclads and
  Eiffel Tower were available without Iron Working. Chivalry and Pikemen
  did not need Iron nor Bronze.
- Pottery was not needed to research Trade, Economics, Explosives,
  Invention, or Sanitation.
- Chemistry was not related to Atomic theory, Refrigeration, Gunpowder,
  Steam Engine, or Steel.
- Theory of Gravity did not need Physics, Invention, or even The Wheel,
  and it was not needed for Automobile, Robotics, or Miniaturization.
- Offshore Platforms did not require Refining, Combustion or Explosives.
  Miniaturization was not needed for Rocketry or Laser.

In the new tree, you are forced to research most of the ancient techs
before you can research the modern ones, but overall, researching paths
are similar to classic tree.


BUILDINGS:
----------

- Aqueduct is cheaper near rivers or lakes. Sewer System is needed to
  grow larger than pop 16 (instead of 12). Each one reduces the chances
  of illness by -30%.

- Created a new building: Ecclesiastical Palace (available with
  Theology), that acts as a second center of government that lowers
  corruption and waste.

- Courthouse: Make_Content = 1, and reduces to half any kind of waste
  (Trade, Shields or Food).

  Added new effect: Food wasted by distance to Palace = -1% Food each 2
  tiles.
  For example, cities at distance 20 of the Palace lose -10% Food
  (-5% with courthouse), so they lose -1 Food when their production
  reaches 10 Food per turn (20 Food per turn with courthouse),
  noticeable when city reaches size 5 or so (around city size 10 with
  courthouse).

- Granary halves the waste of food caused by distance to Palace.
  Together with a Courthouse, it eliminates completely the waste of
  food.

- Police Station: Make_Content = 2, and reduces unhappiness caused by 1
  Military unit.

- Science bonus by buildings (Library, University and Research Lab)
  restored to civ2 values (+50%). There are wonders that double the
  effect later.

- Production bonus by Factory and Mfg Plant reduced to +25% each
  (was +50%), so the Power Plants are as important as the Factories.
  Mfg Plants allows the construction of 2 units per turn.

- Super Highways double the effect of Stock Exchange (+50% to
  Gold/Luxuries), and they produce extra Trade at tiles with roads but
  without farmlands (the classic effect was overpowered under
  Democracy/Republic).

- Doubled costs of all Spaceship parts. All them require Library,
  University, Research Lab and Factory present in the city in order to
  be built.

- Reduced by one the gold upkeep of Aqueduct, Colosseum (renamed to
  Amphitheatre), University, Bank, Stock Exchange, Port Facility,
  SDI Defense, Factory and Mfg Plant.

- Pollution caused by population is increased by buildings instead of by
  techs:
  Industrialization->Factory; Automobile->Highways; Plastics->Mfg Plant;
  Mass Production->Offshore platforms.

- Adjusted the Pollution of all Power Plants, and increased building
  cost of Nuclear Plants:

               Cost  Upkeep   Shields     Pollution(+Recycle)
Power plant    130   4       +25%/+50%    100%(50%)
Hydro plant    180   4       +25%/+50%    50% (25%)
(+Hoover Dam)  (=)  (=)         (=)       25% (0%)
Nuclear plant  240   2       +25%/+50%    50% (25%)
Solar plant    320   4       +25%/+50%    25% (0%)


UNITS:
------

- Settlers pop cost increased to 2 and removed Food upkeep. New unit
  Migrants available to work, or to migrate 1 pop, they can't create
  cities and can be captured. Costs more similar to civ3:

Settlers:  pop_cost = 2, cost = 30, upkeep = 1
Migrants:  pop_cost = 1, cost = 10, upkeep = 1
Workers:   pop_cost = 0, cost = 20, upkeep = 1

- Non-military units now belongs to a new unit class ("Small land") that
  can not pillage, nor capture cities, and does not create Zones of
  Control that would affect the movements of enemy units.

- Created a new unit class for Caravans and Freights ("Merchant") that
  doesn't get the unlimited movement from Maglev, and can be captured.
  They can only establish Trade Routes to foreign cities.

- Land units can capture enemy Migrants (as slaves) and
  Caravans/Freights (as loot).

- Wheeled units (new unit class "Big land") can't move to Mountains,
  Jungles and Swamps, unless they are travelling on a road. They do not
  get defensive bonuses from the terrain, can not perform pillage, and
  need Galleons or Transports to travel by sea.

- Added Elephants from civ2, available with Polytheism:
  (at/def/mov-hp,cost) = (3/2/2-10,30). Obsolete by Dragoons.

- Added Crusaders from civ2, available with Monotheism: (5/1/2-10,40).
  Obsolete by Dragoons. They do not cause military unhappiness.

- Added Fanatics from civ2, available with Guerrilla, under
  Fundamentalism government: (5/5/1-20,20). They cost 1 population, but
  do not cause unhappiness and do not need upkeep.


- Archers defense reduced to 1 (was 2), and cost to 20 (was 30). Legion
  cost reduced to 30 (was 40). This way the ratio Attack/Cost of ancient
  units is more even to Catapults.

- Pikemen changed to (2/3), cost to 30, and removed the doubled defense
  vs horses. Attack of Chariots increased to 4 (was 3). Defense of
  Knights increased to 3 (was 2). In order to encourage early use of
  cavalry.

- Alpine Troops changed to (7/4), and Partisan to (4/5). This way,
  Riflemen do not become obsolete as city defenders until Partisan or
  Marine are researched, and every modern infantry is somehow useful.

- Given Marine ability to Legion, Musketeer, and Rifleman. This way,
  one-tile islands can be assaulted early in game. Yet, the Marine unit
  is still the best offensive/defensive infantry.

- Triremes can navigate rivers. Caravel changed from (2/1) to (1/2), in
  order to encourage peaceful exploration of the seas in the age of
  discovery.

- Removed transport capability from Frigates, to force the use of
  Galleons. Reduced attack of Frigate and defense of Ironclad to 3
  (was 4).

- Battleship hit points reduced to 30 (was 40), Ironclad and Submarine
  to 20 (was 30). Doubled the defense of Destroyers against Submarines.
  Now there is a Rock-paper-scissors relation between
  Destroyer-Cruiser-Submarine.

- All units that had Firepower 2 now have Firepower 1, in order to even
  the power of naval, air, and artillery units, and to simplify the
  mental calculation to compare them.

- Artillery and Howitzer receive the ability CityBuster, so their
  firepower is 1 in open field, and 2 against cities. Removed Ignore
  Walls for Howitzer (that would bypass the new city defense bonuses),
  and reduced movement to 1.

- Bombers and Helicopters receive the Bombarder ability: when they
  attack land units, they can only damage (not kill) them, but damage
  every unit in a stack or city; and are never damaged while attacking.
  Note they have a normal attack against sea units (they still can kill
  or die).
  Halved the attack so it is harder to bombard land enemies
  successfully. Increased hit points so it is still possible to kill
  naval units.

- Air units can perform pillage (representing bombardment of
  infrastructure), and can be Airlifted from a city with an Airport to
  another. Increased defense of all Air units, in order to discourage
  the use of Land units to protect them.

- Increased fuel of all Air units by one, in order to allow battles for
  air control. All Air unit lose 10% of HPs, like helicopters, when they
  end out of a city or airbase.

- Helicopters can carry 1 infantry unit, and can only be attacked by
  Fighters (with no extra attack bonuses), and by Missiles.

- Cruise Missile no longer cause unhappiness, range increased to 16,
  and allowed to attack Air units.

- Nuclear weapons can be built with Nuclear Fission, but you need
  Advanced Flight to move them, and Rocketry to get max movement.

- Readjusted many costs so units with better stats are always more
  expensive. At the same time, modern units always get better ratio
  Att/Cost or Def/Cost.

UNIT            Att  Def  Mov  FP   HP   Cost
Warrior         1    1    1    1    10   10
Phalanx         1    2    1    1    10   20
Archers         3   *1    1    1    10  *20
Legion          4    2    1    1    10  *30  *Marines
Pikemen        *2   *3    1    1    10  *30  *(No bonus anti-horse)
Musketeers      3    3    1    1    20  *40  *Marines
Riflemen        5    4    1    1    20  *50  *Marines
Alpine Troops  *7   *4    1    1    20  *60   IgTer
Partisan        4   *5    1    1    20  *60   IgTer, IgZOC
Fanatics       *5   *5    1    1    20   20  *1 Pop, No upkeep, No unhappy
Marines         8    5    1    1    20   60   Marines
Paratroopers    6    4    1    1    20   60   Paratroopers

Horsemen        2    1    2    1    10   20
Chariot        *4    1    2    1    10   30  *Wheeled
Elephants      *3   *2    2    1    10  *30
Crusaders       5    1    2    1    10   40  *No unhappy
Knights         4   *3    2    1    10   40
Dragoons        5    2    2    1    20   50
Cavalry         8    3    2    1    20   60
Mech. Inf.      6    6    3    1    30  *70  *Wheeled
Armor           10   5    3    1    30  *90  *Wheeled

Catapult        6    1    1    1    10   40  *Wheeled
Cannon          8    1    1    1    20  *50  *Wheeled
Artillery       10  *2    1   *1(2) 20  *60  *Wheeled,*CityBuster
Howitzer        12   2   *1   *1(2) 30  *80  *Wheeled,*CityBuster

Trireme         1    1    3    1    10   40   Cargo 2, Coastal
Caravel        *1   *2    3    1    10   40   Cargo 3
Galleon         0    2    4    1    20  *50   Cargo 4
Transport       0    3    5    1    30  *60   Cargo 8
Carrier        *0    9    5   *1    40   160  Cargo 8

Frigate        *3    2    4    1    20   50  *No Cargo
Ironclad        4   *3    4    1   *20   60
Destroyer       4    4    6    1    30  *80  *(x2 def anti-submarine)
Cruiser         6    6    5   *1    30  *90
AEGIS Cruiser   8    8    5   *1    30   100 *(x5 def anti-air/missile)
Battleship      12   12   4   *1   *30   160
Submarine       12  *5    5   *1   *20  *70   Cargo 8, Invis

Fighter         4   *4    10  *1    20   60   Fuel 2
Bomber         *6   *2    8   *1   *30  *100 *Bombard 3, Fuel 3, FieldUnit
Helicopter     *5    3    6   *1   *30  *70  *Bombard 2,*Cargo 1
Stealth Fighter 8   *8    14  *1    20   80   Fuel 2, Invis
Stealth Bomber *9    5    12  *1   *30  *120 *Bombard 4, Fuel 3, FieldUnit, Invis

Cruise Missile  18   0   *16  *1(2) 10  *50  *CityBuster,*No FieldUnit
Nuclear         99   0    16   1    10   160  Nuclear, FieldUnit

FP = Firepower, HP = Hit Points
* = Changes compared to classic ruleset. Most affected are modern
    infantry, air units, and all units that had 2 firepower.


WONDERS:
--------

Readjusted effects for most wonders. Restored all civ2 costs.

- Modified all effects that worked as if you had certain building in
  every city.

- Replaced every effect Make_Happy, Force_content, and No_unhappy, by
  additional Luxury in the central city tile. Else they would allow a
  possible exploit to avoid unhappiness caused by Military units.

- Replaced effect that gives a percentage bonus to Science output, by
  additional Science in the central city tile. This way, they do not
  multiply the effect of other wonders like Colossus, and it is not an
  advantage to build them all in the same city.

- Wonders become obsolete by techs researched by the owner (not affected
  by the researches of other players).

- Some Wonders require certain building in the city to be built.

FULL LIST OF WONDERS
(#) = Global effect, "Name", Cost, Obsolete, Effect

- "Pyramids" 200, Obsolete by Railroad (that increases even more the
  Shield production):
  +1 Shield per worked tile in the city (already producing Shields).
  Disables tile penalty under Despotism/Tribal governments.
- "Colossus" 200, Obsolete by Automobile (Super Highways):
  +1 Trade per worked tile in the city (already producing Trade).
- "Copernicus' Observatory" 300, Obsolete by Computers (Research Lab):
  +1 Science per worked tile in the city.

- "Hanging Gardens" 200, Obsolete by Electricity (that increases
  Colosseum effect):
  +1 Content in every city. +4 Luxury in the city where it is built.
- "Mausoleum of Mausolos" 200, Obsolete by Sanitation (that enables
  wonder with similar effect):
  +1 Content in every city with Walls, and +1 extra content in every
  city with Courthouse. Your cities cannot be incited to revolt.
- "Temple of Artemis" 200, Requires Temple, Obsolete by Theology (that
  enables wonder with similar effect):
  +2 Content in every city with Temple.
- "Michelangelo's Chapel" 400, Requires Cathedral:
  +3 Content in every city with Cathedral.

- "J.S. Bach's Cathedral" 400:
  +2 Luxuries in every city.
- "Cure For Cancer" 600:
  +2 Luxuries in every city. -10% chance of illness.

- (#)"Shakespeare's Theatre" 300:
  Elvis Specialist_Output = 3 for Every Nation. +1 Luxury in every city,
  +6 Luxury where it is built.
- (#)"A.Smith's Trading Co" 400, Requires Stock Exchange:
  Taxman Specialist_Output = 3 for Every Nation. Free upkeep for
  buildings that cost 1 Gold, in every city with Stock Exchange.
- (#)"Darwin's Voyage" 400:
  Scientist Specialist_Output = 3 for Every Nation. +1 Science in every
  city.

- (#)"Great Library" 300, Requires Library:
  Doubles the effect of Library for Every Nation. Gives an immediate
  technology advance. +4 Science where it is built.
- (#)"Isaac Newton's College" 400, Requires University:
  Doubles the effect of University for Every Nation. Gives an immediate
  technology advance. +6 Science where it is built.
- (#)"Internet" 600, Requires Research Lab:
  Doubles the effect of Research Lab for Every Nation. Gives an
  immediate technology advance. Reveals all cities in the map for the
  owner.

- "Lighthouse" 200, Obsolete by Engineering (Destroyer):
  +1 move, and Veteran built, for Trireme and Sea units.
- "Magellan's Expedition" 400, Obsolete by Nuclear Power (that increases
  even more movement of sea units):
  +1 move, and +50% chance to become veteran, for Sea units (No
  triremes).
- "Sun Tzu's War Academy" 300, Obsolete by Mobile Warfare:
  Veteran built, cumulative to barracks, for Military Land units.

- "Statue of Zeus" 200, Obsolete by Conscription (that enables wonder
  with similar effect):
  +1 Military Content, +1 free Shield per city for upkeep of units.
- "King Richard's Crusade" 300, Obsolete by Communism (Police Station):
  +1 Military Content, +2 free Gold per city for upkeep of units.
- "Women's Suffrage" 600:
  +1 Military Content. Summed to Police Stations effect. Under Democracy
  it halves the unhappiness caused by Military units.

- "Marco Polo's Embassy" 200, Obsolete by Democracy:
  Embassy with all players.
- "Eiffel Tower" 300:
  +10 to AI love for the owner. Reduces the pollution caused by the
  population in all your cities (-25%).
- "Statue of Liberty" 400:
  Disables Has_Senate effect. Any government available. No Anarchy
  periods when government changes.
- (#)"United Nations" 600:
  +10 to AI love for the owner. Revolution_When_Unhappy and Has_Senate
  for Every Nation.

- "Great Wall" 300, Obsolete by Machine Tools (Artillery):
  +50% Defense bonus against Land units in every city, and cities do not
  lose Population due to attacks.
- "Leonardo's Workshop" 400, Obsolete by Combustion:
  Upgrades one obsolete unit per game turn.
- "Hoover Dam" 600, Requires Factory:
  Gives to every Hydro Plant the same effect than Solar Plants
  (-25% pollution).
- (#)"Manhattan Project" 600:
  Enables nuclear units for Every Nation.
- (#)"Apollo Program" 600:
  Enables space race for Every Nation. Makes entire map permanently
  visible for the owner.

Special "Cold War" effect: if Manhattan Project and United Nations were
built, every nation with nuclear power receives the Has_Senate effect,
until the Apollo Program is finished.


SINCE PREVIOUS VERSION:
-----------------------

Changes:
- Enabled Tech Upkeep, and multiplied by number of Cities. Random Tech
  is lost when balance of Bulbs is negative.
- If a city supports more Military Units than its population size, each
  extra unit will waste one Food, no matter the government.
- Large cities (Pop>=8) no longer get extra units free of upkeep or
  military unhappiness. The result is 1, 2, or 3 free units per city,
  depending on the government.
- Disabled happyborders: Units cause military unhappiness if they end
  the turn outside cities or fortresses, no matter if they are inside
  national borders.
- Readjusted effect of some wonders: Mausoleum of Mausolos, Statue of
  Liberty, and those related to military unhappiness. Marco Polo's
  Embassy obsolete by Democracy.
- Fixed Aqueducts (same as Barracks) to avoid duplicated bonuses when
  there are two of them in the same ciy.
- Granary halves the waste of food caused by distance to Palace.
- Swapped Empire Size values for Fundamentalism (now 20) and Monarchy
  (now 12).
- Pollution may appear in ocean tiles. Transports can clean it without
  the need of Workers/Engineers.
- Enabled random disasters, and readjusted effects. Plague renamed to
  Flood.
- No infinite movement: Railroads x6, Roads x3, Rivers x3 (non
  diagonal). All them restricted in enemy territory.
- Electricity allows Irrigation without adjacent water (as in civ3).
- Removed effect that prevented extra output from cities where
  Irrigation and Mine were present at same time (no longer possible).
- Reduced by one the gold upkeep of Aqueduct, Bank, Stock Exchange, Port
  Facility and SDI Defense.
- Added Fort and Airstrip bases, required before you can build Fortress
  or Airbase, respectively. The bases no longer protect full stacks from
  being killed when one unit is defeated.
- Introduced Maglev, available with Superconductors, that allows
  unlimited movement for Land units (except Big Land and Merchant
  classes).
- Wonders become obsolete by techs researched by the owner (not affected
  by the researches of other players).
- A little boost to Federation (+3 Luxury per city, so it is easier to
  celebrate), and Fundamentalism (-50% to science, instead of total
  science output halved).
- The bonus to defense moved to cities with pop>8 (instead of pop>=8),
  so Aqueduct is a prerequisite.
- Tribal government increases by half the chance of land units getting
  the next veteran level after a battle (instead of the extra movement),
  and increases the effect of martial law to 2.
- Construction requires Iron Working instead of Currency. This way,
  Iron Working is a prerequisite to build Frigates and Ironclads.
- Doubled costs of all spaceship parts, so it is harder to achieve a
  space victory.

Terrain:
- Readjusted terrain transformations. Designed so all useful alterations
  can be finished in 1 or 2 steps, and all effects from Global warming
  can be reversibly with terraforming.
- Allowed early transformation from Forest to Grassland, so it is
  possible to transform Grass->Forest->Plain, and also
  Plain->Forest->Grass, with same working time (25).
- Restored Food output of Deep oceans, so Global warming does not affect
  Oceans that much. Now oceans transformed to deep ocean would only lose
  their specials.
- Harbors and Offshore Platform can be built adjacent to any oceanic
  tile again (same as classic rules), so Global warming does not affect
  them.
- Reduced irrigation times in Swamps. They represent the drainage of
  wetlands.
- Re-enabled terraforming from Mountains to Hills, and from Grassland to
  Lake.
  It is still possible to transform any terrain to Hills by changing
  them to Forest first.
- Mountains receive +2 Shields from mines, same than Hills. The tech
  Refining allows to upgrade the mines placed on Deserts and Glaciers
  to Oil Wells (+2 Shields).
- Deep ocean tiles must be mined in order to take advantage of the
  shield bonus from Offshore Platforms (buoys are no longer needed).
- Readjusted transformations caused by global warming and nuclear
  winter. Ocean can no longer change to deep ocean.

Units:
- Units automatically move to the target tile after a successful attack.
  Units with remaining movement points can continue moving after the
  attack.
- Every unit pays some kind of Upkeep cost. Units lose one veteran level
  when upgraded.
- Wheeled units (Big land) can conquer cities again, but do not take
  advantage of terrain defense bonuses. Wheeled units can move to
  fortress even if not roaded. Fixed bug that kept them from entering
  Glacier tiles.
- Fortresses do not affect national borders, and do not protect against
  Air units nor Missiles (they do protect against Land and Sea units,
  included those with CityBuster). Airbases do protect against Air units
  (+100% defend bonus).
- Rebalanced ancient units. Reduced defense of Archers to 1 and cost to
  20 (no IgZoc). Reduced cost of Legion to 30. Increased attack of
  Chariot to 4, attack of Elephant to 3, and defense of Knights to 3.
- Triremes can navigate rivers, but they are affected by ZoC rules while
  moving on a river.
- Caravel changed from (2/1) to (1/2), and cost restored to 40, in order
  to encourage peaceful exploration of the seas in the age of discovery.
  Reduced attack of Frigate and defense of Ironclad to 3 (was 4), and
  restored default costs.
- Air units can perform pillage (representing bombardment of
  infrastructure), and can be Airlifted from a city with Airport to
  another. Increased defense of all Air units, in order to discourage
  the use of land units to protect them. Helicopters can only be
  attacked by Fighters (with no extra attack bonuses).
- Increased fuel of all Air units by one, in order to allow battles for
  air control. All Air unit lose 10% of HPs, like helicopters, when they
  end out of city or airbase. Cruise Missile allowed to attack Air units,
  and increased range to 16.
- Zones of Control are not imposed by non-military units (Small Land and
  Merchant classes) nor by Air units or Missiles, so they do not affect
  the movements of enemy units.
- Diplomats and Spies are invisible like submarines, but they pay upkeep
  costs like all other units.
- Increased vision of Explorer and Partisan.
- Cheating AI level gets +50% defense bonus for units placed in land
  tiles outside cities/fortresses.


THANKS:
-------

To every people who collaborated to create this wonderful Freeciv game.
Specially to those who programmed the Ruleset modding capabilities and
the AI capable to play with them.
Original developer David Fernandez (Bardo).

See also Edit

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